CN112983337A - Packer for plugging and plugging method - Google Patents
Packer for plugging and plugging method Download PDFInfo
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- CN112983337A CN112983337A CN201911213169.4A CN201911213169A CN112983337A CN 112983337 A CN112983337 A CN 112983337A CN 201911213169 A CN201911213169 A CN 201911213169A CN 112983337 A CN112983337 A CN 112983337A
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- packer
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- sleeved
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 113
- 238000004891 communication Methods 0.000 claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 claims abstract description 39
- 238000011010 flushing procedure Methods 0.000 claims abstract description 10
- 239000010985 leather Substances 0.000 claims description 34
- 210000002445 nipple Anatomy 0.000 claims description 34
- 238000003825 pressing Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 4
- 210000004907 gland Anatomy 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 27
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000003814 drug Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 52
- 239000000243 solution Substances 0.000 description 21
- 239000012530 fluid Substances 0.000 description 16
- 239000003795 chemical substances by application Substances 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 9
- 239000004576 sand Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 5
- 101150038956 cup-4 gene Proteins 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000001993 wax Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000012267 brine Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The application discloses a packer for plugging and a plugging method, and belongs to the technical field of packers. The packer for plugging comprises a vertically arranged central tube, a vertically arranged communication outer tube, an upper joint variable buckle, a lower joint variable buckle, a back tightening ring, an upper communication short section, a lower communication short section, an upper sealing element and a lower sealing element. And connecting the upper joint buckle of the packer with a well completion production string, and then lowering the packer to a specified position of an oil layer casing pipe, so that the perforation of the oil well casing pipe is positioned between an upper sealing body and a lower sealing body of the packer. The invention realizes the leakage stoppage of the oil layer casing and solves the technical problem that the existing leakage stoppage can not effectively stop leakage. The detection of production data in the oil well can be carried out through the first through hole, and various solutions which need medicaments or are used for well flushing and killing can be added through the first through hole. The technical problem that production data of an oil well cannot be monitored and acquired after leaking stoppage in the prior art is solved.
Description
Technical Field
The application relates to the technical field of packers, in particular to a packer for plugging and a plugging method.
Background
Both completion production strings and existing packers are common tools in the petroleum industry. Because crude oil has certain chemical corrosivity, and original oil well contains corrosive substances because surface water and well fluid in the production process, or the quality of the equipment of the original oil well and the quality of an oil layer casing pipe have problems, factors such as long exploitation year limit of the oil well lead to the fact that the oil layer casing pipe in a soft stratum far from the ground corrodes to form a perforation, and surface silt and the like flow into the well through the perforation of the oil layer casing pipe to cause that the oil well can not normally produce. Moreover, the fluid produced in the well is blown out through the perforation of the oil layer casing, which causes surface water pollution and ground environment pollution, even causes serious accidents such as blowout, and the like.
The existing oil layer casing pipe plugging methods mainly comprise two types, wherein the first type is to pump various plugging agents into a corrosion perforation position of the oil layer casing pipe for plugging in the production process. The second is that the production process is connected with a leakage blocking tool and a well completion production pipe column, then the leakage blocking tool is sent into the annular space of the casing pipe to isolate the perforation position of the casing pipe to form a section of closed oil layer casing pipe, thereby blocking the silt of the ground and the soft ground layer of the earth surface from flowing into the well and also avoiding the occurrence of various accidents such as the fluid produced in the well from flowing out of the ground.
In the first plugging mode, due to the fact that soft strata such as sediment and the like in the strata are easy to absorb water, the plugging agent enters the soft strata after going out through the perforation part of the oil layer casing pipe, the soft strata absorb the plugging agent, and the plugging agent is not left at the perforation part, so that the plugging agent cannot be left at the perforation part all the time to form effective plugging, the problems that the plugging agent cannot be organically bonded with the oil layer casing pipe and the like exist, and the success rate of the current plugging process of the oil layer casing pipe is low; the second plugging mode is a process method for forming a section of closed oil layer casing through a plugging tool, so that the production data of an oil well cannot be monitored and obtained, and when wax precipitation and sand blockage occur in a pipe column in the well, the well washing and the blockage releasing cannot be implemented, so that the production of the oil well is maintained.
Disclosure of Invention
The embodiment of the application provides a packer for leaking stoppage and a leaking stoppage method, and the technical problems that the existing leaking stoppage can not be stopped effectively, and production data of an oil well can not be monitored and acquired after leaking stoppage can be solved. The technical scheme is as follows:
on one hand, the invention provides a packer for plugging, which comprises a vertically arranged central tube, a vertically arranged communication outer tube, an upper joint variable buckle, a lower joint variable buckle, a back fastening ring, an upper communication short section, a lower communication short section, an upper sealing element and a lower sealing element, wherein the upper joint variable buckle, the upper communication short section, the upper sealing element, the communication outer tube, the lower sealing element, the lower communication short section and the lower joint variable buckle are sequentially sleeved on the outer wall of the central tube, and communication channels are arranged between the upper communication short section, the upper sealing element, the communication outer tube, the lower sealing element and the outer wall of the central tube, wherein:
the outer wall of the top end of the central tube is sleeved with the upper connector variable buckle, and the outer wall of the bottom end of the central tube is sleeved with the lower connector variable buckle;
the outer wall of the upper joint variable buckle is sleeved with the back fastening ring, and the outer wall close to the bottom end of the upper joint variable buckle is sleeved with the upper communicating short section;
the top end of the upper communication nipple is abutted against the bottom end of the back fastening ring, the upper sealing element is sleeved on the outer wall close to the bottom of the upper communication nipple, a first through hole is formed in the outer wall of the upper communication nipple, and the first through hole is located between the upper joint variable buckle and the upper sealing element and is communicated with the communication channel;
the upper sealing piece and the lower sealing piece are respectively sleeved on two sides of the communicating outer pipe;
the outer wall close to the top of the lower communication nipple is sleeved with the lower sealing element, the outer wall of the lower communication nipple is provided with a second through hole, and the second through hole is positioned between the lower sealing element and the lower joint buckle and is communicated with the communication channel;
the lower joint variable buckle is sleeved on the bottom end of the central pipe and is close to the outer wall of the top end of the lower joint variable buckle, and the lower communicating short section is sleeved on the outer wall of the top end of the lower joint variable buckle.
The packer has the beneficial effects that the upper joint buckle of the packer is connected with a well completion production string, and then the packer is put into a specified position of an oil layer casing pipe, so that a perforation of the oil layer casing pipe is positioned between an upper sealing body and a lower sealing body of the packer. Because the packer goes up sealing member and lower sealing member and contradicts with the oil reservoir sleeve pipe inner wall all the time when oil reservoir sleeve pipe internal motion, so when oil reservoir sleeve pipe's perforation was located between packer's last sealing member and the lower sealing member, realized the isolation of oil reservoir sleeve pipe's perforation position, formed one section solitary pipe section space of an oil reservoir sleeve pipe inner wall and made oil reservoir sleeve pipe's perforation position be located in solitary pipe section space. Therefore, the sand and sand of the ground and the soft ground layer can be prevented from flowing into the well, and the fluid produced in the well can be prevented from escaping from the ground through the perforation on the oil layer casing pipe, and other various accidents can be avoided. The oil layer casing leakage stoppage is realized, and the technical problem that the existing leakage stoppage cannot be effectively stopped is solved. Because first through-hole and second through-hole all communicate with the intercommunication passageway, so communicate passageway, go up intercommunication nipple joint and communicate the nipple joint down and form a through-going passageway. Therefore, the extraction detection of the production data in the oil well and the pressure detection through the first through hole can be carried out through the through channel. But also can be added with various needed agents or solutions for well washing and killing through the first through hole. The technical problems that production data of an oil well cannot be monitored and acquired after leaking stoppage in the prior art, and the oil well production cannot be maintained by washing the well and releasing the oil well when wax and sand are deposited on a pipe column in the well are solved. The monitoring and the collection of data in the oil well after leaking stoppage are realized. The back fastening ring is beneficial to fixing the upper joint buckle, and the upper joint buckle is convenient to be connected with a well completion production string. And various paraffin removal agents and antiscaling agents can be added and injected through the first through hole, and viscosity reducing agents can be injected during the exploitation of the heavy oil well. Greatly prolonging the service life of the equipment and reducing the difficulty of mining.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, go up the sealing member and become the knot including the last sealing leather cup and the last cap that presses of conical form, wherein:
the top of the upper pressure cap variable buckle is sleeved on the outer wall of the upper communication short section, and the bottom of the upper pressure cap variable buckle is sleeved on the outer wall of the communication outer pipe;
the upper sealing leather cup is sleeved on the outer wall of the upper communicating short section, and the bottom of the upper sealing leather cup is a small-caliber end and is in interference fit with the top of the upper pressure cap variable buckle;
the first through hole is located between the upper joint variable buckle and the upper sealing leather cup, and the communication channel is arranged between the upper sealing leather cup and the upper pressing cap variable buckle and the central pipe.
The oil layer sleeve pipe sealing structure has the beneficial effects that the upper sealing leather cup is in a conical shape, and the bottom end of the upper sealing leather cup is a small-caliber end, so that the upper sealing leather cup is favorable for downward movement in the oil layer sleeve pipe and is difficult to move upwards, and the upper sealing leather cup is well abutted against the inner wall of the oil layer sleeve pipe to seal. The upper pressing cap variable buckle is in interference fit with the upper pressing cap variable buckle, so that the sliding sealing of the upper sealing leather cup and the inner wall of the oil layer casing pipe is facilitated.
Furthermore, the upper pressure cap variable buckle is in threaded connection with the upper communication short section and the communication outer pipe.
Adopt above-mentioned further scheme's beneficial effect be, go up to press the cap to become to detain can with last intercommunication nipple joint and the more stable connection of intercommunication outer tube.
Further, lower sealing member includes that the lower seal leather cup of conical form becomes to detain with pressing the cap down, wherein:
the top of the lower pressing cap variable buckle is sleeved on the outer wall of the communicating outer pipe, and the bottom of the lower pressing cap variable buckle is sleeved on the outer wall of the lower communicating short section;
the lower sealing leather cup is sleeved on the outer wall of the lower communicating short section, and the top of the lower sealing leather cup is a small-caliber end and is in interference fit with the bottom of the lower pressing cap variable buckle;
the second through hole is formed between the lower joint variable buckle and the lower sealing leather cup, and the communicating channel is formed between the lower sealing leather cup and the lower pressing cap variable buckle and the central pipe.
The beneficial effect who adopts above-mentioned further scheme is that, because lower seal leather cup is the toper form and the top is small-bore end, so be favorable to lower seal leather cup upward movement in the oil reservoir sleeve pipe, and be difficult to the downstream, thereby fine realization is sealed with the conflict of oil reservoir sleeve pipe inner wall. The cooperation of upper and lower seal leather cup makes can be better to the reservoir casing formation confined pipeline section of pipe with reservoir casing's perforation thereby. The interference fit of the lower pressing cap variable buckle and the lower pressing cap variable buckle is beneficial to the sliding seal of the lower sealing leather cup and the inner wall of the oil layer casing.
Further, the lower pressing cap variable buckle is in threaded connection with the lower communicating short section and the communicating outer pipe.
Adopt above-mentioned further scheme's beneficial effect be, push down the cap become detain with communicate the nipple joint down with the intercommunication outer tube can realize more stable connection, and easily dismouting.
Further, the communication outer pipe is located in the middle of the central pipe.
Adopt above-mentioned further scheme's beneficial effect be favorable to the symmetry of upper seal body and lower seal body to set up the both sides at the center tube. The stability and the aesthetic property of the packer are kept.
Furthermore, the top end of the central tube is in threaded connection with the upper joint buckle, and the bottom end of the central tube is in threaded connection with the lower joint buckle.
In another aspect, the invention provides a method for plugging by using the packer for plugging, which comprises the following steps:
a. connecting the upper joint buckle of the packer with a well completion production string;
b. and then the packer is lowered to a specified position in the oil layer casing through a well completion production string, so that the perforation of the oil layer casing is positioned between the upper sealing body and the lower sealing body of the packer, and the leakage stoppage of the oil layer casing is realized.
The packer has the advantages that the upper sealing element and the lower sealing element are always in sliding seal with the inner wall of the oil layer casing when the packer moves in the oil layer casing, namely the packer is plugged into the oil layer casing, so that when the perforation of the oil layer casing is positioned between the upper sealing element and the lower sealing element of the packer, the isolation of the perforation position of the oil layer casing is realized, a section of independent pipe section space of the inner wall of the oil layer casing is formed, and the perforation position of the oil layer casing is positioned in the independent pipe section space. Therefore, the sand and sand of the ground and the soft ground layer can be prevented from flowing into the well, and the fluid produced in the well can be prevented from escaping from the ground through the perforation on the oil layer casing pipe, and other various accidents can be avoided. The oil layer casing leakage stoppage is realized, and the technical problem that the existing leakage stoppage cannot be effectively stopped is solved. Because first through-hole and second through-hole all communicate with the intercommunication passageway, so communicate passageway, go up intercommunication nipple joint and communicate the nipple joint down and form a through-going passageway. Therefore, a through channel is formed in the communication channel, the upper communication short section and the lower communication short section. Therefore, the production data in the oil well can be detected through the through channel, and the pressure can be detected through the first through hole.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, after the step b, pumping a solution through a first through hole in the upper communication nipple to wash the well;
and extracting a downhole solution from the first through hole on the upper communication nipple by a pump to extract downhole sample liquid.
The beneficial effect who adopts above-mentioned further scheme is, through go up when the first through-hole pump on the intercommunication nipple joint goes into solution and washes the well, solution can be for washing well liquid or kill fluid. The well killing fluid can achieve well killing, and the flushing fluid can clean the inside of an oil well. The well-flushing liquid can be used for circularly flushing a well, removing wax and releasing stuck well and circularly flushing and killing the well during the workover treatment on the oil well, thereby avoiding the occurrence of pollution accidents and the normal production of the oil well. The technical problem that the well washing and the blockage releasing can not be implemented when the wax precipitation and the sand blockage occur in the well pipe column so as to maintain the production of the oil well is solved. The pump is used for extracting the underground solution from the first through hole in the upper communication nipple, and the underground sample liquid is extracted, so that the technical problem that the production data of an oil well cannot be monitored after leaking stoppage in the prior art is solved.
In another aspect, the present invention provides a method for plugging a shallow casing by using the packer for plugging described above, comprising the following steps:
a. connecting the upper joint buckle of the packer with a well completion production string;
b. and then the packer is lowered to a designated position in the shallow casing through a well completion production string, so that the perforation of the shallow casing is positioned between the upper sealing body and the lower sealing body of the packer, and the plugging of the shallow casing is realized.
The packer has the advantages that the shallow casing is easy to corrode and perforate, the success rate of the packer used for the shallow casing is high, and the damage and the plugging failure of the packer caused by the fact that the packer bears larger pressure can be avoided due to the low pressure of the shallow casing. Therefore, when the packer is used for plugging on a shallow casing, the service life of the packer is longer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of the present application;
FIG. 2 is a schematic view in half section of the present application;
FIG. 3 is an enlarged partial view of portion A of FIG. 1 of the present application;
FIG. 4 is an enlarged view of a portion B of FIG. 1 of the present application;
FIG. 5 is a schematic view of the configuration of the present application with the packer extending into the casing.
Illustration of the drawings:
1. the upper joint becomes to detain, 2, the ring is tightened to the back, 3, go up the intercommunication nipple joint, 301, first through-hole, 4, last sealing leather cup, 5, go up the pressure cap and become to detain, 6, the center tube, 601, first opening, 602, the second opening, 7, the intercommunication outer tube, 8, the pressure cap becomes to detain down, 9, lower sealing leather cup, 10, lower intercommunication nipple joint, 101, the second through-hole, 11, lower joint become to detain, 12, the perforation, 13, the oil reservoir casing pipe, 14, the intercommunication passageway.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
In this mode, a packer for leaking stoppage is provided, as shown in fig. 1 to 4, a packer for leaking stoppage includes a vertically-arranged central tube 6, a vertically-arranged communication outer tube 7, an upper joint change buckle 1, a lower joint change buckle 11, a back tightening ring 2, an upper communication short section 3, a lower communication short section 10, an upper sealing element and a lower sealing element, the upper joint change buckle 1, the upper communication short section 3, the upper sealing element, the communication outer tube 7, the lower sealing element, the lower communication short section 10 and the lower joint change buckle 11 are all sequentially sleeved on the outer wall of the central tube 6, the upper communication short section 3, the upper sealing element, the communication outer tube 7, the lower sealing element, the lower communication short section 10 and a communication channel 14 is arranged between the outer wall of the central tube 6, wherein: the outer wall of the top end of the central tube 6 is sleeved with the upper joint variable buckle 1, and the outer wall of the bottom end of the central tube 6 is sleeved with the lower joint variable buckle 11. The outer wall of the upper joint variable buckle 1 is sleeved with the back fastening ring 2, and the outer wall close to the bottom end of the upper joint variable buckle 1 is sleeved with the upper communication short section 3; the back fastening ring 2 can be in threaded connection with the upper joint buckle 1 or can be fixedly sleeved. The top end of the upper communication nipple 3 is abutted against the bottom end of the back fastening ring 2, the outer wall close to the bottom of the upper communication nipple 3 is sleeved with the upper sealing element, as shown in fig. 3, the outer wall of the upper communication nipple 3 is provided with a first through hole 301, and the first through hole 301 is positioned between the upper joint change buckle 1 and the upper sealing element and is communicated with the communication channel 14; the upper sealing piece and the lower sealing piece are respectively sleeved on two sides of the communicating outer pipe 7; the outer wall close to the top of the lower communication nipple 10 is sleeved with the lower sealing element, the outer wall of the lower communication nipple 10 is provided with a second through hole 101, and the second through hole 101 is located between the lower sealing element and the lower joint buckle 11 and is communicated with the communication channel 14; the lower joint variable buckle 11 is sleeved at the bottom end of the central tube 6 and close to the outer wall of the top end of the lower joint variable buckle 11, and the lower communicating short section 10 is sleeved on the outer wall of the top end of the lower joint variable buckle 11. It is noted that the first through hole 301 and the second through hole 101 may be in any shape such as triangular or circular.
In the embodiment of the present disclosure, the upper sealing element and the lower sealing element may adopt a slip, a rubber sleeve, a leather cup, or other components that can be abutted against the inner wall of the production casing and can achieve sliding sealing. I.e. components capable of achieving a sliding seal with the production casing, are protected by the present invention. It is to be noted that the communication passage 14 communicates with the outside through the first through hole 301, and the communication passage 14 may also communicate with the outside through the second through hole 101. The communication passage 14, the first through hole 301 and the second through hole 101 form a through passage.
In the operation of a particular open hole plugging verification test, the packer upper sub variation 1 is connected to the completion production string, as shown in fig. 5, and the packer is then lowered into the production casing 13 to a specified position such that the perforations 12 of the production casing 13 are located between the packer upper and lower seals. Since the upper and lower sealing members always collide with the inner wall of the casing 13 to achieve sliding sealing when the packer moves in the casing 13, when the perforation 12 of the casing 13 is located between the upper and lower sealing members of the packer, isolation of the perforation 12 of the casing 13 is achieved, that is, an individual pipe section space in the casing 13 is formed and the perforation 12 of the casing 13 is located in the individual pipe section space. Thereby preventing the silt in the ground and the soft ground from flowing into the well and preventing the produced fluid in the well from flowing out of the ground through the perforation 12 on the oil layer casing pipe 13 and other accidents. The leakage stoppage of the oil layer casing 13 is realized, and the technical problem that the leakage can not be effectively stopped in the existing leakage stoppage is solved. Since the communication passage 14, the first through hole 301 and the second through hole 101 form a through passage, not only the detection of the production data in the oil well and the pressure detection through the first through hole 301 can be performed through the through passage. But also various agents required or solutions for well-flushing can be added through the first through-hole 301. The technical problem that production data of an oil well cannot be monitored and acquired after leaking stoppage in the prior art is solved. The monitoring and the collection of data in the oil well after leaking stoppage are realized.
Optionally, as shown in fig. 2, the upper sealing element includes a conical upper sealing cup 4 and an upper pressing cap buckle 5, wherein: the top of the upper pressure cap variable buckle 5 is sleeved on the outer wall of the upper communication short section 3, and the bottom of the upper pressure cap variable buckle 5 is sleeved on the outer wall of the communication outer pipe 7; the upper sealing leather cup 4 is sleeved on the outer wall of the upper communicating nipple 3, the bottom of the upper sealing leather cup 4 is a small-caliber end and is in interference fit with the top of the upper pressure cap variable buckle 5; the first through hole 301 is located between the upper joint buckle changer 1 and the upper sealing cup 4, and the communication channel 14 is arranged between the upper sealing cup 4 and the upper pressure cap buckle changer 5 and the central pipe 6.
Optionally, as shown in fig. 1, the upper pressure cap variable buckle 5 is in threaded connection with both the upper communication nipple 3 and the communication outer pipe 7.
Optionally, as shown in fig. 1 and 2, the lower sealing element includes a conical lower sealing cup 9 and a lower pressing cap buckle 8, wherein: the top of the lower pressing cap variable buckle 8 is sleeved on the outer wall of the communication outer pipe 7, and the bottom of the lower pressing cap variable buckle 8 is sleeved on the outer wall of the lower communication short section 10; the lower sealing leather cup 9 is sleeved on the outer wall of the lower communicating nipple 10, the top of the lower sealing leather cup 9 is a small-caliber end and is in interference fit with the bottom of the lower pressing cap variable buckle 8; the second through hole 101 is located between the lower joint variable buckle 11 and the lower sealing cup 9, and the communication channel 14 is arranged between the lower sealing cup 9 and the lower pressing cap variable buckle 8 and the central tube 6.
Optionally, as shown in fig. 1 and 2, the lower pressing cap variable buckle 8 is in threaded connection with both the lower communication nipple 10 and the communication outer pipe 7.
Alternatively, as shown in fig. 1 and 2, the communication outer tube 7 is located in the middle of the center tube 6.
Alternatively, as shown in fig. 1 and 2, the top end of the central tube 6 is screwed with the upper connector buckle 1, and the bottom end of the central tube 6 is screwed with the lower connector buckle 11.
The invention also provides a method for stopping leakage, which comprises the following steps:
a. connecting an upper joint buckle 1 of the packer with a well completion production string;
b. and then the packer is lowered to a specified position in the oil layer casing through a well completion production string, so that the perforation of the oil layer casing is positioned between the upper sealing body and the lower sealing body of the packer, and the leakage stoppage of the oil layer casing is realized.
It should be noted that, in step b, the pressure condition under the oil well can be detected through the first through hole 301, so that the downhole condition can be better understood. The solution is pumped from the first through hole 301 by a pump, and the solution sequentially passes through the first opening 601, the communication channel 14 and the second through hole 101 and then enters the well. Because the perforation of the oil casing is positioned in the closed pipe section of the oil casing between the upper sealing body and the lower sealing body, the solution successfully avoids the perforation of the oil casing and avoids the solution from flowing out through the perforation. Therefore, the sand and sand of the ground and the soft ground layer can be prevented from flowing into the well, and the fluid produced in the well can be prevented from escaping from the ground through the perforation on the oil layer casing pipe, and other various accidents can be avoided. The oil layer casing leakage stoppage is realized, and the technical problem that the existing leakage stoppage cannot be effectively stopped is solved.
Optionally, after the step b, pumping a solution through the first through hole 301 on the upper communication nipple 3 to wash the well; and extracting a downhole solution from the first through hole 301 on the upper communication nipple 3 through a pump to extract downhole sample liquid.
The solution is a well killing fluid or a well flushing fluid. The kill fluid may be one of a polymeric brine, a solidfree brine, or a modified kill fluid, such as anhydrous powdered calcium chloride. The flushing fluid may be a viscosifier or fluid loss additive containing solution, such as a power flushing fluid produced by baiyang oil science ltd. And the well can be flushed and killing by pumping in the solution. The solution in the oil well can be returned to the first through hole 301 through the second through hole 101 through the pump, so that the solution in the oil well is extracted, the underground solution is extracted, the underground sample liquid is extracted, and the underground sample liquid can be analyzed and subjected to data monitoring.
The invention also provides a method for stopping leakage on a shallow casing by using the packer for stopping leakage, which comprises the following steps:
a. connecting an upper joint buckle 1 of the packer with a well completion production string;
b. and then the packer is lowered to a designated position in the shallow casing through a well completion production string, so that the perforation of the shallow casing is positioned between the upper sealing body and the lower sealing body of the packer, and the plugging of the shallow casing is realized.
The shallow casing pipe is easy to corrode and perforate, the success rate of the packer used for the shallow casing pipe is high, and the damage and the plugging failure of the packer caused by the fact that the packer bears larger pressure can be avoided due to the low pressure of the shallow casing pipe. Therefore, when the packer is used for plugging on a shallow casing, the service life of the packer is longer.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The packer for plugging is characterized by comprising a vertically arranged central tube (6), a vertically arranged communication outer tube (7), an upper joint variable buckle (1), a lower joint variable buckle (11), a back tightening ring (2), an upper communication short section (3), a lower communication short section (10), an upper sealing element and a lower sealing element, wherein the upper joint variable buckle (1), the upper communication short section (3), the upper sealing element, the communication outer tube (7), the lower sealing element, the lower communication short section (10) and the lower joint variable buckle (11) are sequentially sleeved on the outer wall of the central tube (6), a communication channel (14) is arranged between the upper communication short section (3), the upper sealing element, the communication outer tube (7), the lower sealing element, the lower communication short section (10) and the outer wall of the central tube (6), wherein:
the outer wall of the top end of the central tube (6) is sleeved with the upper connector variable buckle (1), and the outer wall of the bottom end of the central tube (6) is sleeved with the lower connector variable buckle (11);
the outer wall of the upper joint variable buckle (1) is sleeved with the back tightening ring (2), and the outer wall close to the bottom end of the upper joint variable buckle (1) is sleeved with the upper communicating short section (3);
the top end of the upper communication short section (3) is abutted against the bottom end of the back fastening ring (2), the upper sealing element is sleeved on the outer wall close to the bottom of the upper communication short section (3), a first through hole (301) is formed in the outer wall of the upper communication short section (3), and the first through hole (301) is located between the upper joint variable buckle (1) and the upper sealing element and is communicated with the communication channel (14);
the upper sealing element and the lower sealing element are respectively sleeved on two sides of the communicating outer pipe (7);
the outer wall close to the top of the lower communication nipple (10) is sleeved with the lower sealing element, a second through hole (101) is formed in the outer wall of the lower communication nipple (10), and the second through hole (101) is located between the lower sealing element and the lower joint variable buckle (11) and is communicated with the communication channel (14);
the lower joint variable buckle (11) is sleeved at the bottom end of the central pipe (6) and close to the outer wall of the top end of the lower joint variable buckle (11) and is sleeved with the lower communicating short section (10).
2. A packer for plugging according to claim 1, wherein said upper seal comprises a cone-shaped upper sealing cup (4) and an upper pressure cap variation buckle (5), wherein:
the top of the upper pressure cap variable buckle (5) is sleeved on the outer wall of the upper communication short section (3), and the bottom of the upper pressure cap variable buckle (5) is sleeved on the outer wall of the communication outer pipe (7);
the upper sealing leather cup (4) is sleeved on the outer wall of the upper communicating short section (3), the bottom of the upper sealing leather cup (4) is a small-caliber end and is in interference fit with the top of the upper pressure cap variable buckle (5);
the first through hole (301) is located the top connection becomes to detain (1) with between last sealing leather cup (4), go up sealing leather cup (4) with go up the pressure cap become to detain (5) with be equipped with between center tube (6) intercommunication passageway (14).
3. A packer for plugging according to claim 2, wherein said upper pressure cap variation buckle (5) is threaded both with said upper communication nipple (3) and with said communication outer tube (7).
4. A packer for plugging according to any of claims 1 to 3, wherein said lower seal comprises a cone-shaped lower sealing cup (9) and a lower gland button (8), wherein:
the top of the lower pressing cap variable buckle (8) is sleeved on the outer wall of the communicating outer pipe (7), and the bottom of the lower pressing cap variable buckle (8) is sleeved on the outer wall of the lower communicating short section (10);
the lower sealing leather cup (9) is sleeved on the outer wall of the lower communicating short section (10), the top of the lower sealing leather cup (9) is a small-caliber end and is in interference fit with the bottom of the lower pressing cap variable buckle (8);
the second through hole (101) is located between the lower joint variable buckle (11) and the lower sealing leather cup (9), and the lower sealing leather cup (9) and the lower pressing cap variable buckle (8) are arranged between the central pipe (6) and the communicating channel (14).
5. The packer for plugging according to claim 4, wherein the lower pressure cap varying buckle (8) is in threaded connection with both the lower communication nipple (10) and the communication outer pipe (7).
6. A packer for plugging according to claim 1, wherein said communication outer tube (7) is located in an intermediate position of said central tube (6).
7. A packer for plugging according to claim 1, wherein the top end of the central tube (6) is threaded with the upper sub button (1) and the bottom end of the central tube (6) is threaded with the lower sub button (11).
8. A method of plugging with a packer as claimed in any one of claims 1 to 7, comprising the steps of:
a. connecting an upper joint buckle (1) of the packer with a well completion production string;
b. and then the packer is lowered to a specified position in the oil layer casing through a well completion production string, so that the perforation of the oil layer casing is positioned between the upper sealing body and the lower sealing body of the packer, and the leakage stoppage of the oil layer casing is realized.
9. Method for plugging according to claim 8, further comprising, after step b, pumping a solution through the first through hole (301) of the upper communication nipple (3) to perform a well-flushing;
and extracting a downhole solution from the first through hole (301) on the upper communication nipple (3) through a pump to extract downhole sample liquid.
10. A method of plugging on a shallow casing using the packer for plugging according to any one of claims 1 to 7, comprising the steps of:
a. connecting an upper joint buckle (1) of the packer with a well completion production string;
b. and then the packer is lowered to a designated position in the shallow casing through a well completion production string, so that the perforation of the shallow casing is positioned between the upper sealing body and the lower sealing body of the packer, and the plugging of the shallow casing is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213169.4A CN112983337A (en) | 2019-12-02 | 2019-12-02 | Packer for plugging and plugging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911213169.4A CN112983337A (en) | 2019-12-02 | 2019-12-02 | Packer for plugging and plugging method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112983337A true CN112983337A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911213169.4A Pending CN112983337A (en) | 2019-12-02 | 2019-12-02 | Packer for plugging and plugging method |
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| Country | Link |
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| CN (1) | CN112983337A (en) |
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|---|---|---|---|---|
| US5355956A (en) * | 1992-09-28 | 1994-10-18 | Halliburton Company | Plugged base pipe for sand control |
| US5954132A (en) * | 1996-11-05 | 1999-09-21 | Harris; Todd K. | Patching of injection and production well annular casing leaks for restoring mechanical integrity |
| CN2550488Y (en) * | 2002-07-17 | 2003-05-14 | 韩明胜 | Sleeve blocking packer |
| CN201037385Y (en) * | 2006-10-17 | 2008-03-19 | 中国石油化工股份有限公司 | Bridge type leak-stopping pipe column |
| CN202866761U (en) * | 2012-09-03 | 2013-04-10 | 梁菊英 | Strong-releasing type leakage-preventing well washing oil production device |
| CN206495669U (en) * | 2017-01-22 | 2017-09-15 | 中国石油化工股份有限公司 | Card pipe string for plugging shallow-layer sleeve leakage water injection well |
| CN207795140U (en) * | 2018-01-30 | 2018-08-31 | 中国石油天然气股份有限公司 | Self-expansion sealing washable well downhole plugging tool |
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2019
- 2019-12-02 CN CN201911213169.4A patent/CN112983337A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5355956A (en) * | 1992-09-28 | 1994-10-18 | Halliburton Company | Plugged base pipe for sand control |
| US5954132A (en) * | 1996-11-05 | 1999-09-21 | Harris; Todd K. | Patching of injection and production well annular casing leaks for restoring mechanical integrity |
| CN2550488Y (en) * | 2002-07-17 | 2003-05-14 | 韩明胜 | Sleeve blocking packer |
| CN201037385Y (en) * | 2006-10-17 | 2008-03-19 | 中国石油化工股份有限公司 | Bridge type leak-stopping pipe column |
| CN202866761U (en) * | 2012-09-03 | 2013-04-10 | 梁菊英 | Strong-releasing type leakage-preventing well washing oil production device |
| CN206495669U (en) * | 2017-01-22 | 2017-09-15 | 中国石油化工股份有限公司 | Card pipe string for plugging shallow-layer sleeve leakage water injection well |
| CN207795140U (en) * | 2018-01-30 | 2018-08-31 | 中国石油天然气股份有限公司 | Self-expansion sealing washable well downhole plugging tool |
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Application publication date: 20210618 |